US20150175124A1 - Webbing take-up device - Google Patents
Webbing take-up device Download PDFInfo
- Publication number
- US20150175124A1 US20150175124A1 US14/573,190 US201414573190A US2015175124A1 US 20150175124 A1 US20150175124 A1 US 20150175124A1 US 201414573190 A US201414573190 A US 201414573190A US 2015175124 A1 US2015175124 A1 US 2015175124A1
- Authority
- US
- United States
- Prior art keywords
- spool
- energy absorption
- pawl
- lock
- pull
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/341—Belt retractors, e.g. reels comprising energy-absorbing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/34—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables
- B65H75/38—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material
- B65H75/44—Constructional details
- B65H75/4418—Arrangements for stopping winding or unwinding; Arrangements for releasing the stop means
- B65H75/4428—Arrangements for stopping winding or unwinding; Arrangements for releasing the stop means acting on the reel or on a reel blocking mechanism
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
- B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
- B60R2022/288—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices with means to adjust or regulate the amount of energy to be absorbed
Definitions
- the present invention relates to a webbing take-up device provided with an energy absorption member.
- the anchor tab engages with the internal gear each time the seatbelt lock actuation mechanism is actuated (each time the lock ring rotates in the pull-out direction by the specific angle) as described above, therefore there is possibility of wear of the anchor tab occurring.
- a structure enabling margin for durability of the anchor tab to be improved is therefore desirable.
- the present invention is to obtain a webbing take-up device enabling improvement of margin for durability of a pawl that actuates an energy absorption mechanism.
- a webbing take-up device of a first aspect includes: a spool that rotates in a pull-out direction by a webbing being pulled out; a first energy absorption member that extends along an axial center of the spool, that has one end portion engaged with the spool such that the first energy absorption member is capable of rotating integrally with the spool, and that is configured so as to be capable of undergoing torsional deformation; a lock mechanism that is engaged with another end portion of the first energy absorption member so as to be capable of rotating integrally with the first energy absorption member, and that actuates to block rotation of the first energy absorption member in the pull-out direction at least one of when a vehicle suddenly decelerates or when the spool suddenly rotates in the pull-out direction; an energy absorption mechanism that includes a second energy absorption member, that actuates by being coupled to the spool, and that deforms the second energy absorption member; and a pawl that is provided at the spool, that actuates by the
- the first energy absorption member is disposed extending along the axial center of the spool.
- the one end portion of the first energy absorption member is engaged with the spool such that the first energy absorption member is capable of rotating integrally (as a unit) with the spool, and the lock mechanism is engaged with the another end portion of the first energy absorption member so as to be capable of rotating integrally (as a unit) with the first energy absorption member.
- the spool and the lock mechanism are thus coupled together through the first energy absorption member so as to be capable of rotating integrally (as a unit).
- the lock mechanism actuates to block (prevent) rotation of the first energy absorption member in the pull-out direction in at least one event of a sudden vehicle deceleration or a sudden rotation of the spool in the pull-out direction. Rotation of the spool in the pull-out direction is accordingly also blocked (prevented), enabling an increase in the restraining force of the webbing on an occupant in a vehicle emergency.
- the first energy absorption member undergoes torsional deformation (twisting deformation) when rotation force acting on the spool in the pull-out direction exceeds the mechanical strength of the first energy absorption member. Accordingly, kinetic energy of the occupant, which is used to pull the webbing, is absorbed by the first energy absorption member.
- the webbing take-up device also includes the energy absorption mechanism in addition to the first energy absorption member.
- the energy absorption mechanism is configured including the second energy absorption member. Configuration is made such that the energy absorption mechanism actuates to deform the second energy absorption member by the energy absorption mechanism being coupled to the spool.
- the pawl provided at the spool actuates by rotation of the spool in the pull-out direction relative to the lock mechanism, and the spool and the energy absorption mechanism are coupled by the pawl.
- the pawl is actuated by the first energy absorption member undergoing twisting deformation after actuation of the lock mechanism.
- configuration is made such that the pawl does not actuate until the first energy absorption member undergoes twisting deformation.
- the number of times the pawl is actuated can accordingly be reduced in comparison to a case in which the pawl always actuates on actuation of the lock mechanism. This thereby enables margin for durability of the pawl that actuates the energy absorption mechanism to be improved.
- a webbing take-up device of a second aspect is the webbing take-up device of the first aspect, wherein the pawl is disposed adjacent to the lock mechanism in an axial direction of the spool.
- the pawl is disposed adjacent to the lock mechanism in the axial direction of the spool, thus enabling an efficient arrangement to be achieved in the structure of the webbing take-up device, as well as enabling a simple structure for the webbing take-up device.
- a webbing take-up device of a third aspect is the webbing take-up device of the second aspect, wherein the lock mechanism includes a base member that is engaged with the another end portion of the first energy absorption member so as to be capable of rotating integrally with the first energy absorption member; a groove portion that opens toward a side of the pawl is formed at the base member; a shaft portion, that is inserted inside the groove portion, is formed at the pawl; and the shaft portion moves along the groove portion by the spool rotating in the pull-out direction relative to the lock mechanism, and the pawl moves toward a side of the energy absorption mechanism.
- the lock mechanism includes the base member, and the base member is engaged with the another end portion of the first energy absorption member so as to be capable of rotating integrally (as a unit) with the first energy absorption member.
- the base member is moreover formed with the groove portion, and the shaft portion of the pawl is inserted inside the groove portion.
- the webbing take-up device further includes a guiding mechanism, provided at at least one of the pawl or the lock mechanism, that guides the pawl so as to move toward a side of the energy absorption mechanism due to the spool rotating in the pull-out direction relative to the lock mechanism.
- an efficient arrangement can be achieved in the structure of the webbing take-up device, as well as enabling a simple structure for the webbing take-up device.
- FIG. 1 is an exploded perspective view showing relevant portions of a webbing take-up device according to an exemplary embodiment
- FIG. 2 is a schematic cross-section showing relevant portions of the webbing take-up device shown in FIG. 1 ;
- FIG. 3 is a perspective view of the spool and the lock base shown in FIG. 1 ;
- FIG. 4 is an enlarged cross-section showing a housed state of a slider in the body shown in FIG. 1 ,
- FIG. 5 is an explanatory drawing viewed from one side in the spool axial direction, to explain deformation of a wire by a first deforming portion and a second deforming portion when the slider shown in FIG. 1 is disposed in an initial position;
- FIG. 6 is an explanatory drawing, corresponding to FIG. 5 , to explain a state in which a switching mechanism has actuated, and the slider has moved from the state shown in FIG. 5 toward a direction away from a second energy absorption portion.
- a webbing take-up device 10 is configured including a frame 12 that is fixed to a vehicle body, a spool 20 disposed inside the frame 12 , and a torsion shaft 40 serving as a “first energy absorption member”.
- the webbing take-up device 10 further includes a lock mechanism 50 , a sensor mechanism 60 (see FIG. 2 ), an energy absorption mechanism 70 , a switching mechanism 100 , and a FL lock pawl 120 serving as a “pawl”. Explanation follows regarding respective configurations thereof.
- the frame 12 is configured including a frame body 14 and a side plate 16 .
- the frame body 14 includes a plate shaped back plate 14 A, fixed to the vehicle body.
- a side plate 14 B extends substantially at a right angle from one width direction end of the back plate 14 A (the end on the arrow C direction side in FIG. 1 ).
- the frame body 14 further includes a coupling tab (piece) 14 C that faces an upper portion of the back plate 14 A (a portion on the arrow E direction side in FIG. 1 ).
- the coupling tab 14 C extends from an upper portion of a leading end of the side plate 14 B.
- a leading end portion of the coupling tab 14 C is formed with a first attachment tab (piece) 14 D, the first attachment tab 14 D being bent toward the back plate 14 A side so as to face the side plate 14 B.
- a second attachment tab (piece) 14 E extends substantially at a right angle from another width direction end of the back plate 14 A, the second attachment tab 14 E being disposed facing the side plate 14 B.
- the extension length of the second attachment tab 14 E is set shorter than the extension length of the side plate 14 B, and the second attachment tab 14 E is disposed in the same plane as (flush with) the first attachment tab 14 D.
- the side plate 16 is formed in a substantially rectangular plate shape, and is disposed parallel to the first attachment tab 14 D and the second attachment tab 14 E.
- the side plate 16 is fixed to the first attachment tab 14 D and the second attachment tab 14 E through a body 72 , described later.
- a circular shaped placement hole 16 A is formed in the side plate 16 , and ratchet teeth 16 B (inner teeth) are formed around the entire inner circumference of the placement hole 16 A.
- the spool 20 is formed in a substantially circular cylinder shape, is disposed inside the frame 12 with the axial direction along the width direction of the back plate 14 A, and is indirectly supported by the frame 12 so as to be capable of rotation.
- One end portion in a length direction (a base end portion) of a webbing 30 is coupled and fixed to the spool 20 .
- the webbing 30 is taken up from a base end side in a layered shape on an outer peripheral portion of the spool 20 by rotation of the spool 20 in a take-up direction (the arrow A direction in FIG. 1 ).
- Configuration is made such that by pulling a side of anther end portion in the length direction (a leading end portion) of the webbing 30 , the spool 20 is rotated in a pull-out direction (the arrow B direction in FIG. 1 ), pulling the webbing 30 out from the spool 20 .
- a through hole (penetrate-hole) 22 is formed penetrating in an axial center portion of the spool 20 .
- a support shaft 34 A of a pinion 34 configuring a known pre-tensioner mechanism 32 is fitted into a portion of the through hole 22 on one end side in the axial direction of the spool 20 (the arrow C direction side in FIG. 2 ), so as to be capable of rotating as integrally (as a unit) therewith.
- one end side of the pinion 34 is formed with pinion teeth 34 B, and the pinion teeth 34 B are disposed on the one side in the axial direction of the spool 20 (the arrow C direction side in FIG.
- the biasing mechanism 36 includes a spiral spring (not shown in the drawings). A spiral direction inside end of the spiral spring is fixed to the one end portion 34 C of the pinion 34 , and the spiral direction outside end of the spiral spring is coupled to the side plate 14 B (the frame 12 ), such that the spiral spring biases the spool 20 in the take-up direction.
- an engaged portion 22 A is formed, that is engaged with the torsion shaft 40 , described later, at a position adjacent to the support shaft 34 A of the pinion 34 .
- An inner peripheral portion of the engaged portion 22 A is formed with a spline shape as viewed along the axial direction of the spool 20 .
- a pawl housing portion 24 is formed, that houses a FL lock pawl 120 , described later. The pawl housing portion 24 is disposed further to the outer side in the radial direction of the spool 20 than the through hole 22 , and is open toward the outer side in the radial direction of the spool 20 (see FIG. 3 ).
- the torsion shaft 40 is disposed coaxially to the spool 20 , and is inserted into the through hole 22 .
- One end portion of the torsion shaft 40 (the end portion on the arrow C direction side in FIG. 2 ) is formed with a first engagement portion 42 .
- An outer peripheral portion of the first engagement portion 42 is formed with a spline shape (see FIG. 1 for details), and the first engagement portion 42 is fitted into and engages with the engaged portion 22 A of the spool 20 .
- the torsion shaft 40 accordingly engages with the spool 20 so as to be capable of rotating integrally (as a unit) therewith.
- Another end portion of the torsion shaft 40 projects out further than the spool 20 toward the another side in the axial direction of the spool 20 , and is rotatably supported by a sensor cover 62 of the sensor mechanism 60 , described later.
- a second engagement portion 44 is formed, that engages with the lock base 52 of the lock mechanism 50 , described later.
- the second engagement portion 44 is disposed further toward the another side in the axial direction of the spool 20 than the pawl housing portion 24 of the spool 20 , and an outer peripheral portion of the second engagement portion 44 is formed with a spline shape (see FIG. 1 for details).
- a portion of the torsion shaft 40 between the first engagement portion 42 and the second engagement portion 44 configures a first energy absorption portion 46 .
- the first energy absorption portion 46 is formed in a shaft shape with a circular cross-section profile.
- the first energy absorption portion 46 described in more detail later, is configured so as to undergo torsional deformation (twisting deformation) to absorb kinetic energy of an occupant, which is used for a pulling of the webbing 30 .
- the lock mechanism 50 is configured including a lock plate 54 and a lock base 52 serving as “base member”.
- the lock base 52 is formed in a substantially circular cylinder shape, and is disposed at the another side in the axial direction of the spool 20 (the arrow D direction side in FIGS. 1 and 3 ) with respect to the spool 20 .
- the lock base 52 is integrally formed with a substantially circular cylinder shaped circular cylinder shaft 52 A, the circular cylinder shaft 52 A being disposed coaxially to the lock base 52 , and projecting out from the lock base 52 toward the spool 20 side.
- An engaged hole 52 B is formed at an axial center portion of the lock base 52 , the engaged hole 52 B being formed with a spline shape as viewed along the axial direction of the lock base 52 (see FIG. 3 ).
- the second engagement portion 44 of the torsion shaft 40 is fitted into and engages with the engaged hole 52 B inside, such that the lock base 52 (the lock mechanism 50 ) and the torsion shaft 40 engage so as to be capable of rotating integrally (as a unit).
- the lock base 52 is disposed adjacent to the pawl housing portion 24 of the spool 20 , on the another side in the axial direction of the spool 20 (see FIG. 2 ).
- the guide groove 52 C serving as “groove portion” is formed (configuring “guiding mechanism”) (see FIG. 3 ), that is for leading (guiding) the FL lock pawl 120 described later.
- the guide groove 52 C is formed in a substantially S-shape as viewed along the axial direction of the spool 20 , and is open toward the spool 20 side.
- the lock plate 54 is formed in a substantially rectangular plate shape, and is movably disposed inside the lock base 52 .
- a plate shaped plate cover 56 is provided at the another side in the axial direction of the spool 20 with respect to the lock base 52 , the plate cover 56 restricting movement of the lock plate 54 toward the another side in the axial direction (the arrow D direction side in FIG. 1 ) at the lock base 52 .
- One end portion of the lock plate 54 is integrally formed with a circular column shaped guide projection 54 A. The guide projection 54 A projects out from the lock plate 54 toward the opposite side to the spool 20 .
- the guide projection 54 A is inserted through a hole portion 56 A formed at the plate cover 56 , and is movably inserted inside a guide groove 64 A of a V gear 64 configuring the sensor mechanism 60 , described later (see FIG. 2 ).
- the one end portion of the lock plate 54 is formed with ratchet teeth 54 B, and the ratchet teeth 54 B are configured so as to be capable of meshing with the ratchet teeth 16 B of the side plate 16 of the frame 12 described above.
- the sensor mechanism 60 is disposed on the another aside in the axial direction of the spool 20 with respect to the frame 12 .
- the sensor mechanism 60 includes a sensor cover 62 , the sensor cover 62 being formed in a substantially box shape open toward the frame 12 side and being coupled to the frame 12 .
- the V gear 64 that has a substantially circular disk shape is provided inside the sensor cover 62 .
- the V gear 64 is disposed coaxially to the spool 20 , and is rotabably supported by the another end portion of the torsion shaft 40 .
- the guide groove 64 A is formed, and the guide projection 54 A of the lock plate 54 is movably inserted inside the guide groove 64 A.
- the sensor mechanism 60 is configured to actuate in at least one event of a sudden vehicle deceleration or a sudden rotation of the spool 20 in the pull-out direction.
- rotation of the V gear 64 in the pull-out direction is restricted, and the spool 20 (the lock base 52 ) rotates in the pull-out direction relative to the V gear 64 .
- Configuration is made such that due to the lock base 52 rotating in the pull-out direction with respect to the V gear 64 , the guide projection 54 A of the lock plate 54 moves within the guide groove 64 A of the V gear 64 , such that the lock plate 54 moves toward the outer side in the radial direction of the lock base 52 , and the ratchet teeth 54 B of the lock plate 54 meshes with the ratchet teeth 16 B of the frame 12 .
- the energy absorption mechanism 70 is provided between the frame 12 and the sensor mechanism 60 . Moreover, as shown in FIG. 1 , the energy absorption mechanism 70 is configured including a body 72 , a lock ring 80 (which is an element recognized broadly as a “rotating body”), a slider 86 , and a wire 90 serving as a “second energy absorption member”.
- the body 72 is formed in a substantially rectangular parallelopiped box shape open toward the frame 12 side, and is fixed to the first attachment tab 14 D and the second attachment tab 14 E of the frame 12 .
- the side plate 16 of the frame 12 described above is fastened and fixed to a bottom wall 72 A of the body 72 from the another side in the axial direction of the spool 20 .
- a recess portion 74 open toward the another side in the axial direction of the spool 20 , is formed at a substantially central portion of the body 72 .
- the recess portion 74 is formed in a substantially circular shape as viewed along the axial direction of the spool 20 , and is disposed coaxially to the spool 20 .
- a circular shaped placement hole 74 B is formed at a bottom wall 74 A of the recess portion 74 , penetrating the bottom wall 74 A, and the placement hole 74 B being disposed coaxially to the spool 20 .
- the pawl housing portion 24 of the spool 20 is disposed within the placement hole 74 B and the recess portion 74 .
- a pair of deforming columns 76 and 78 are integrally formed at an upper portion of the bottom wall 74 A of the recess portion 74 .
- the deforming columns 76 and 78 are formed in column shapes, projecting out from the bottom wall 74 A toward the another side in the axial direction of the spool at a separation from each other in the circumferential direction of the placement hole 74 B.
- first deforming portions 76 A and 78 A are formed at outer peripheral portions of the deforming columns 76 and 78 .
- the first deforming portions 76 A and 78 A are curved so as to protrude toward the upper side as viewed along the axial direction of the spool 20 . As shown in FIG.
- a communication hole 74 C in which the slider 86 , described later, is disposed, is formed at an upper portion at a side wall of the recess portion 74 .
- the communication hole 74 C places the inside of the recess portion 74 in communication with the inside of the body 72 .
- a gas generator housing portion 79 that houses a gas generator 110 of the switching mechanism 100 , described later, is integrally formed at a portion of an upper portion of the body 72 which portion is on the opposite side to the frame 12 .
- the gas generator housing portion 79 is formed in a bottomed, substantially circular cylinder shape, and is disposed with its axial direction along the extension direction of the side plate 14 B (along the arrow G direction and the arrow H direction in FIG. 1 ).
- the lock ring 80 is formed in a substantially circular cylinder shape, and is disposed coaxially to the spool 20 .
- the lock ring 80 is rotatably supported at the body 72 inside the recess portion 74 of the body 72 , and is disposed at the outer side in the radial direction of the spool 20 with respect to the pawl housing portion 24 of the spool 20 .
- a ring shaped flange portion 80 A is integrally formed at one end portion in the axial direction of the lock ring 80 (end portion on the arrow C direction side in FIG. 1 ).
- the flange portion 80 A is disposed facing an inner peripheral face of the recess portion 74 of the body 72 .
- the pair of deforming columns 76 and 78 described above are disposed at the outer side in the radial direction of the lock ring 80 with respect to the ring shaped flange portion 80 A.
- Ratchet teeth 80 B are formed at an inner peripheral portion of the lock ring 80 at a portion at the one end side in the axial direction of the lock ring 80 .
- the ratchet teeth 80 B are formed around the entire circumference of the lock ring 80 .
- the ratchet teeth 80 B are moreover configured so as to be capable of meshing with the ratchet teeth 120 B of the FL lock pawl 120 described later.
- an anchor groove 82 is formed that anchors an anchor hook 92 of the wire 90 , described later.
- the anchor groove 82 is formed in a slit shape, and is open toward the another side in the axial direction of the lock ring 80 .
- a wire attachment face 84 onto which the wire 90 is wound, described later, is configured at an outer peripheral portion of the lock ring 80 , the wire attachment face 84 being disposed facing the inner peripheral face of the recess portion 74 of the body 72 , and forming a concentric circular shape with the outer peripheral portion of the spool 20 as viewed along the spool 20 axial direction.
- the slider 86 is formed in a substantially rectangular column shape with its length direction along an up and down direction (the arrow E direction and the arrow F direction in FIG. 1 ). Moreover, as shown in FIG. 5 , the slider 86 is housed inside the body 72 at the upper side of the lock ring 80 , and is supported by the bottom wall 72 A of the body 72 so as to be capable of sliding in the up and down direction.
- a lower end face of the slider 86 configures a second deforming portion 86 A.
- the second deforming portion 86 A is curved in a substantially circular arc shape protruding toward the lower side (toward the axial center side) as viewed along the spool 20 axial direction.
- a stopper projection 86 B is integrally formed to a lower end portion of the slider 86 at a portion on the side of the bottom wall 72 A of the body 72 . The stopper projection 86 B projects out toward the lower side with respect to the second deforming portion 86 A of the slider 86 .
- an upper end face of the slider 86 abuts a lower face of a leading end portion (another end portion) of a piston 108 , described later, blocking (preventing) movement of the slider 86 toward the upper side.
- the second deforming portion 86 A of the slider 86 is disposed between the pair of deforming columns 76 and 78 (in what is referred to below as the “initial position”).
- the wire 90 is configured by an elongated wire member, and is attached to the wire attachment face 84 of the lock ring 80 .
- one end portion in a length direction of the wire 90 is formed with the anchor hook 92 that is bent around into a substantially U-shape.
- the bent portion of the anchor hook 92 is inserted into the anchor groove 82 of the lock ring 80 , anchoring the anchor hook 92 in the anchor groove 82 .
- the wire 90 extends from the anchor hook 92 (one end portion) around on the wire attachment face 84 toward the take-up direction, and is wound onto the wire attachment face 84 from the anchor hook 92 (one end portion) to another end portion in the length direction of the wire (see FIG. 1 for details).
- the wire 90 In the wound-on state of the wire 90 to the wire attachment face 84 , the wire 90 is disposed in a layered shape along the axial direction of the lock ring 80 , and the another end in the length direction of the wire 90 is open (free). The wire 90 is accordingly disposed between the wire attachment face 84 and the inner peripheral face of the recess portion 74 .
- a portion of the wire 90 wound onto the wire attachment face 84 is drawn out from the wire attachment face 84 toward outer side in the radial direction of the lock ring 80 , curving so as to pass between the first deforming portions 76 A and 78 A of the pair of deforming columns 76 and 78 and the second deforming portion 86 A of the slider 86 .
- This drawn-out portion configures a second energy absorption portion 94 .
- the second energy absorption portion 94 abuts the first deforming portions 76 A and 78 A and the second deforming portion 86 A, and is bent into a substantially M-shape as viewed along the spool 20 axial direction. In this state, as shown in FIG.
- the stopper projection 86 B and the wire 90 overlap each other in the spool 20 axial direction (the arrow C direction and the arrow D direction in FIG. 4 ), and the stopper projection 86 B restricts movement of the wire 90 toward the another side in the axial direction of the lock ring 80 (the arrow D direction side in FIG. 4 ).
- the second energy absorption portion 94 of the wire 90 is deformed by the pair of first deforming portions 76 A and 78 A and the second deforming portion 86 A (“the second energy absorption portion 94 of the wire 90 ” and “the pair of first deforming portions 76 A and 78 A and the second deforming portion 86 A” are abutted each other and relatively pressed each other, so the second energy absorption portion 94 of the wire 90 is deformed).
- the energy absorption mechanism 70 when the energy absorption mechanism 70 is actuated, the second energy absorption portion 94 of the wire 90 is deformed, and the first energy absorption portion 46 of the torsion shaft 40 undergoes twisting deformation. Configuration is thus made such that kinetic energy of the occupant, which is used for pulling of the webbing 30 , is absorbed by the first energy absorption portion 46 and the second energy absorption portion 94 .
- the switching mechanism 100 is configured including a cylinder 102 , the piston 108 , and the gas generator 110 .
- the cylinder 102 is housed inside the body 72 at the upper side of the lock ring 80 .
- the cylinder 102 is formed in a substantially rectangular tube shape, and is disposed with its axial direction running parallel to the axial direction of the gas generator housing portion 79 of the body 72 .
- a substantially tube shaped tube shaped portion 104 is integrally provided, the tube shaped portion 104 projecting out from the cylinder 102 toward the side of the gas generator housing portion 79 of the body 72 (the another side in the axial direction of the spool 20 ) and placing the inside of the cylinder 102 in communication with the inside of the gas generator housing portion 79 .
- the frame 12 side of the cylinder 102 is provided with a substantially rectangular plate shaped support plate 106 .
- the support plate 106 is fastened and fixed to the body 72 with the plate thickness direction of the support plate 106 being in the spool 20 axial direction. Movement of the cylinder 102 toward the frame 12 side is accordingly restricted by the support plate 106 .
- the piston 108 is formed in a substantially rectangular parallelopiped block shape, with its length direction along the axial direction of the cylinder 102 .
- One end portion of the piston 108 (the arrow H direction end portion in FIG. 1 ) is integrally formed with a substantially cube shaped base portion 108 A, and the base portion 108 A is inserted inside the cylinder 102 in a sealed state. Configuration is made such that actuation of the gas generator 110 , described later, supplies gas into the cylinder 102 , moving the piston 108 toward the another end side (the arrow G side in FIG. 1 ) of the cylinder 102 .
- An intermediate portion in the length direction of the piston 108 is formed with a switching concave (indentation) portion 108 B, the switching concave portion 108 B being formed in a concave (indented) shape open toward the one side in the axial direction of the spool 20 (the support plate 106 side), and passing through (penetrating) the piston 108 in the up and down direction (the arrow E direction and arrow F direction in FIG. 1 ).
- the gas generator 110 is formed in a substantially circular column shape, housed inside the gas generator housing portion 79 of the body 72 .
- the gas generator 110 is electrically connected to a controller of the vehicle (not shown in the drawings). Configuration is made such that on actuation of the gas generator 110 under control of the controller, the gas generator 110 generates gas and supplies the gas into the cylinder 102 , moving the piston 108 toward the another end side of the cylinder 102 .
- the controller is moreover electrically connected to a frame (physique) detection section, not shown in the drawings.
- the frame detection section detects the frame (physique) of an occupant seated in a seat using, for example, a load sensor, a belt sensor, a seat position sensor, and(or) the like.
- the load sensor detects load acting on a vehicle seat
- the frame detection section detects the frame of the occupant using the detected load.
- the belt sensor detects a pull-out amount of the webbing 30 from the spool 20
- the frame detection section detects the frame of the occupant using the detected pull-out amount.
- the seat position sensor is configured by a position detection sensor that detects a slide position of the vehicle seat in the front and rear direction, or a camera sensor provided in the vehicle compartment.
- the frame detection section detects the frame of the occupant using the seat position detected by the seat position sensor.
- the controller is moreover electrically connected to a collision detection section, not shown in the drawings.
- the collision detection section predicts a vehicle collision using, for example, an acceleration sensor that detects the acceleration (in particular sudden deceleration) of the vehicle, a distance sensor that detects the distance to obstacle in front of vehicle, and(or) the like. Configuration is made such that the collision detection section detects a vehicle collision by the acceleration sensor detecting a collision acceleration of a predetermined reference value or greater.
- Configuration is made such that the controller actuates the gas generator 110 of the switching mechanism 100 in a case in which, based on a signal from the frame detection section, the controller has determined the frame of the occupant to be smaller than a predetermined reference value, and based on a signal from the collision detection section, the controller has determined that the vehicle has been involved in a collision.
- the FL lock pawl 120 is formed in a substantially triangular plate shape, and is movably housed inside the pawl housing portion 24 of the spool 20 . Namely, the FL lock pawl 120 is disposed adjacent to the lock base 52 of the lock mechanism 50 in the spool 20 axial direction.
- a circular column shaped guide shaft 120 A (configuring “guiding mechanism”), serving as a “shaft portion”, is integrally formed to one end portion of the FL lock pawl 120 .
- the guide shaft 120 A projects out toward the lock base 52 side, and is movably inserted into one end portion of the guide groove 52 C of the lock base 52 (see FIG. 2 ).
- an outer peripheral portion of the one end portion of the FL lock pawl 120 is formed with ratchet teeth 120 B.
- the ratchet teeth 120 B are exposed from the pawl housing portion 24 in a housed state of the FL lock pawl 120 inside the pawl housing portion 24 of the spool 20 (see FIG. 3 ).
- the guide shaft 120 A of the FL lock pawl 120 is moved from the one end portion toward the another end portion of the guide groove 52 C.
- the FL lock pawl 120 accordingly moves toward the outer side in the radial direction of the spool 20 , and the ratchet teeth 120 B of the FL lock pawl 120 mesh with the ratchet teeth 80 B of the lock ring 80 (see FIG. 5 and FIG. 6 ).
- the lock ring 80 and the spool 20 are accordingly coupled together by the FL lock pawl 120 , to give a configuration in which the spool 20 and the lock ring 80 rotate integrally (as a unit) in the pull-out direction. Namely, configuration is made such that the energy absorption mechanism 70 is actuated by coupling of the lock ring 80 and the spool 20 by the FL lock pawl 120 .
- the webbing 30 is pulled out from the spool 20 and mounted over the body of the occupant by pulling on the leading end side of the webbing 30 .
- Rotation of the lock base 52 in the pull-out direction is thus blocked (prevented), blocking (preventing) rotation of the torsion shaft 40 and the spool 20 in the pull-out direction.
- the webbing 30 is thereby restricted from being pulled out from the spool 20 , and the body of the occupant that is attempting to move toward the front of the vehicle is restrained by the webbing 30 .
- the body of the occupant can accordingly be restrained by the webbing 30 as a result.
- the first energy absorption portion 46 undergoes twisting deformation when a rotation force of the spool 20 in the pull-out direction, caused by the body of the occupant pulling on the webbing 30 with greater force, exceeds a twisting withstand load (deformation withstand load) of the first energy absorption portion 46 . Accordingly, rotation of the spool 20 in the pull-out direction is permitted at a first force limiter load (the load required for the first energy absorption portion 46 to undergo twisting deformation) or greater, and kinetic energy of the occupant, which is used for pulling on the webbing 30 , is absorbed by the first energy absorption portion 46 . Load (burden) on the chest of the occupant from the webbing 30 can be reduced as a result.
- the spool 20 rotates in the pull-out direction relative to the lock mechanism 50 (the lock base 52 ).
- the guide shaft 120 A of the FL lock pawl 120 provided at the spool 20 moves from the one end portion to the other end portion of the guide groove 52 C, and the FL lock pawl 120 moves toward the outer side in the radial direction of the spool 20 .
- the ratchet tooth 26 B of the FL lock pawl 120 accordingly mesh with the ratchet teeth 80 B of the lock ring 80 , such that the lock ring 80 and the spool 20 are coupled together through the FL lock pawl 120 (see FIG. 5 ).
- the lock ring 80 and the spool 20 are accordingly capable of rotating together integrally (as a unit) in the pull-out direction.
- the lock ring 80 rotates in the pull-out direction (the arrow B direction in FIG. 5 ) when the rotation force of the spool 20 in the pull-out direction exceeds the twisting withstand load (deformation withstand load) of the first energy absorption portion 46 of the torsion shaft 40 and the deformation withstand load of the second energy absorption portion 94 of the wire 90 .
- the second energy absorption portion 94 of the wire 90 is deformed by the first deforming portions 76 A and 78 A of the deforming columns 76 and 78 and the second deforming portion 86 A of the slider 86 .
- a second force limiter load (the total of the load required for the first energy absorption portion 46 to undergo twisting deformation and the load required to deform the second energy absorption portion 94 of the wire 90 ) or greater, and kinetic energy of the occupant, which is used for pulling on the webbing 30 , is absorbed by the first energy absorption portion 46 and the second energy absorption portion 94 .
- the switching mechanism 100 is actuated by the controller of the vehicle.
- the controller determines whether or not the body of the occupant is the predetermined reference value or greater based on a signal from the frame detection section, and determines whether or not the vehicle has been involved in a collision based on a signal from the collision detection section.
- the gas generator 110 is not actuated, and so the second deforming portion 86 A of the slider 86 presses the second energy absorption portion 94 of the wire 90 toward the lower side in a state in which the slider 86 is disposed in the initial position as shown in FIG. 5 . Accordingly, rotation of the spool 20 in the pull-out direction at the second force limiter load described above or greater is permitted in a case in which the body of the occupant is the predetermined reference value or greater.
- the gas generator 110 is actuated under the control of the controller.
- gas is supplied from the gas generator 110 into the cylinder 102 .
- the piston 108 moves toward the another end side of the cylinder 102 . Accordingly, as shown in FIG. 6 , due to the actuation of the gas generator 110 , the piston 108 moves toward the another end side of the cylinder 102 , disposing the switching concave portion 108 B of the piston 108 at the upper side of (above) the slider 86 .
- the FL lock pawl 120 is actuated by rotation of the spool 20 in the pull-out direction relative to the lock base 52 , thereby coupling the spool 20 to the lock ring 80 of the energy absorption mechanism 70 by the FL lock pawl 120 .
- the number of times the FL lock pawl 120 is actuated can accordingly be reduced in comparison to a case in which the FL lock pawl 120 always actuates when actuation of the lock mechanism 50 . Wear and the like of the ratchet teeth 120 B of the FL lock pawl 120 can accordingly be suppressed.
- Margin for durability of the FL lock pawl 120 that actuates the energy absorption mechanism 70 is accordingly improved.
- the FL lock pawl 120 is disposed adjacent to (the lock base 52 of) the lock mechanism 50 in the spool 20 axial direction. Accordingly, an efficient arrangement can be achieved in the structure of the webbing take-up device 10 , as well as enabling a simple structure of the webbing take-up device 10 .
- the lock base 52 of the lock mechanism 50 is formed with the guide groove 52 C, and the guide shaft 120 A of the FL lock pawl 120 is inserted inside the guide groove 52 C.
- the guide shaft 120 A of the FL lock pawl 120 moves within the guide groove 52 C of the lock base 52 , such that the FL lock pawl 120 is guided (moved) toward the lock ring 80 side of the energy absorption mechanism 70 .
- the FL lock pawl 120 is accordingly guided (moved) toward the lock ring 80 side interlockingly to the relative rotation of the spool 20 with respect to the lock base 52 , enabling early actuation of the FL lock pawl 120 .
- configuration is made such that the guide shaft 120 A of the FL lock pawl 120 moves within the guide groove 52 C of the lock base 52 , thereby moving the FL lock pawl 120 toward the outer side in the radial direction of the spool 20 ; however, the configuration by which the FL lock pawl 120 is moved toward the outer side in the radial direction of the spool 20 (the guiding mechanism) is not limited thereto.
- configuration may be made such that when the spool 20 rotates in the pull-out direction relative to the lock base 52 , the FL lock pawl 120 is moved toward the outer side in the radial direction of the spool 20 by a spring member, such as a compression spring.
- a retention member that retains a compression spring in a compressed state may be provided such that when the spool 20 rotates in the pull-out direction relative to the lock base 52 , the retention of the compression spring by the retention member is released, and the FL lock pawl 120 is moved toward the outer side in the radial direction of the spool 20 by biasing force of the compression spring.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
In a webbing take-up device, a FL lock pawl is actuated by rotation of a spool in a pull-out direction relative to a lock base, coupling the spool and a lock ring of an energy absorption mechanism together by the FL lock pawl. A reduction in number of times the FL lock pawl is actuated is thereby enabled in comparison to a case in which the FL lock pawl always actuates on actuation of a lock mechanism. The occurrence of wear or the like of ratchet teeth of the FL lock pawl is suppressed as a result. Accordingly, improvement of margin for durability of the FL lock pawl that actuates the energy absorption mechanism is enabled.
Description
- This application claims priority under 35 USC 119 from Japanese Patent Application No. 2013-265610 filed Dec. 24, 2013, the disclosure of which is incorporated by reference herein.
- 1. Field of the Invention
- The present invention relates to a webbing take-up device provided with an energy absorption member.
- 2. Related Art
- In a seatbelt retractor (webbing take-up device) described in Japanese Patent Application Laid-Open (JP-A) No. 2001-347921, after actuation of a seatbelt lock actuation mechanism (lock mechanism), rotation force of a spool in a pull-out direction is transmitted to a first torsion bar (first energy absorption member) and a second torsion bar (second energy absorption member), and the first torsion bar and the second torsion bar undergo twisting deformation, thereby absorbing impact energy.
- Brief explanation follows regarding this transmission of rotation force from the spool to the second torsion bar. When actuation of the seatbelt lock actuation mechanism, a main pawl meshes with a lock ring, and the lock ring locks after rotating by a specific angle in the pull-out direction. When the lock ring rotates in the pull-out direction, an anchor tab engages with an internal gear interlocking to the rotation of the lock ring, so locking rotation of the internal gear. The rotation force of the spool is thereby transmitted to the second torsion bar via a planetary gear mechanism, a first pulley, and a second pulley.
- However, in the seatbelt retractor described above, the anchor tab engages with the internal gear each time the seatbelt lock actuation mechanism is actuated (each time the lock ring rotates in the pull-out direction by the specific angle) as described above, therefore there is possibility of wear of the anchor tab occurring. A structure enabling margin for durability of the anchor tab to be improved is therefore desirable.
- In consideration of the above circumstances, the present invention is to obtain a webbing take-up device enabling improvement of margin for durability of a pawl that actuates an energy absorption mechanism.
- A webbing take-up device of a first aspect includes: a spool that rotates in a pull-out direction by a webbing being pulled out; a first energy absorption member that extends along an axial center of the spool, that has one end portion engaged with the spool such that the first energy absorption member is capable of rotating integrally with the spool, and that is configured so as to be capable of undergoing torsional deformation; a lock mechanism that is engaged with another end portion of the first energy absorption member so as to be capable of rotating integrally with the first energy absorption member, and that actuates to block rotation of the first energy absorption member in the pull-out direction at least one of when a vehicle suddenly decelerates or when the spool suddenly rotates in the pull-out direction; an energy absorption mechanism that includes a second energy absorption member, that actuates by being coupled to the spool, and that deforms the second energy absorption member; and a pawl that is provided at the spool, that actuates by the spool rotating in the pull-out direction relative to the lock mechanism, and that couples the spool and the energy absorption mechanism.
- In the webbing take-up device of the first aspect, the first energy absorption member is disposed extending along the axial center of the spool. The one end portion of the first energy absorption member is engaged with the spool such that the first energy absorption member is capable of rotating integrally (as a unit) with the spool, and the lock mechanism is engaged with the another end portion of the first energy absorption member so as to be capable of rotating integrally (as a unit) with the first energy absorption member. The spool and the lock mechanism are thus coupled together through the first energy absorption member so as to be capable of rotating integrally (as a unit). The lock mechanism actuates to block (prevent) rotation of the first energy absorption member in the pull-out direction in at least one event of a sudden vehicle deceleration or a sudden rotation of the spool in the pull-out direction. Rotation of the spool in the pull-out direction is accordingly also blocked (prevented), enabling an increase in the restraining force of the webbing on an occupant in a vehicle emergency.
- In an actuated state of the lock mechanism, the first energy absorption member undergoes torsional deformation (twisting deformation) when rotation force acting on the spool in the pull-out direction exceeds the mechanical strength of the first energy absorption member. Accordingly, kinetic energy of the occupant, which is used to pull the webbing, is absorbed by the first energy absorption member.
- The webbing take-up device also includes the energy absorption mechanism in addition to the first energy absorption member. The energy absorption mechanism is configured including the second energy absorption member. Configuration is made such that the energy absorption mechanism actuates to deform the second energy absorption member by the energy absorption mechanism being coupled to the spool.
- Namely, when the energy absorption mechanism has been actuated, kinetic energy of the occupant, which is used to pull the webbing, is absorbed by the first energy absorption member and the second energy absorption member.
- Note that the pawl provided at the spool actuates by rotation of the spool in the pull-out direction relative to the lock mechanism, and the spool and the energy absorption mechanism are coupled by the pawl. Namely, the pawl is actuated by the first energy absorption member undergoing twisting deformation after actuation of the lock mechanism. In other words, configuration is made such that the pawl does not actuate until the first energy absorption member undergoes twisting deformation. The number of times the pawl is actuated can accordingly be reduced in comparison to a case in which the pawl always actuates on actuation of the lock mechanism. This thereby enables margin for durability of the pawl that actuates the energy absorption mechanism to be improved.
- A webbing take-up device of a second aspect is the webbing take-up device of the first aspect, wherein the pawl is disposed adjacent to the lock mechanism in an axial direction of the spool.
- In the webbing take-up device of the second aspect, the pawl is disposed adjacent to the lock mechanism in the axial direction of the spool, thus enabling an efficient arrangement to be achieved in the structure of the webbing take-up device, as well as enabling a simple structure for the webbing take-up device.
- A webbing take-up device of a third aspect is the webbing take-up device of the second aspect, wherein the lock mechanism includes a base member that is engaged with the another end portion of the first energy absorption member so as to be capable of rotating integrally with the first energy absorption member; a groove portion that opens toward a side of the pawl is formed at the base member; a shaft portion, that is inserted inside the groove portion, is formed at the pawl; and the shaft portion moves along the groove portion by the spool rotating in the pull-out direction relative to the lock mechanism, and the pawl moves toward a side of the energy absorption mechanism.
- In the webbing take-up device of the third aspect, the lock mechanism includes the base member, and the base member is engaged with the another end portion of the first energy absorption member so as to be capable of rotating integrally (as a unit) with the first energy absorption member. The base member is moreover formed with the groove portion, and the shaft portion of the pawl is inserted inside the groove portion. When the spool rotates in the pull-out direction relative to the lock mechanism, the shaft portion moves along the groove portion, and the pawl is moved toward the energy absorption mechanism side by the groove portion. Due thereto, the pawl is moved toward the energy absorption mechanism side interlockingly to (according with) the rotation of the spool in the pull-out direction relative to the lock mechanism, thereby enabling early actuation of the pawl.
- In the aspects, it is possible that the webbing take-up device further includes a guiding mechanism, provided at at least one of the pawl or the lock mechanism, that guides the pawl so as to move toward a side of the energy absorption mechanism due to the spool rotating in the pull-out direction relative to the lock mechanism.
- According to the webbing take-up device of the first aspect, improvement of degrees of margin are enabled for durability of the pawl.
- According to the webbing take-up device of the second aspect, an efficient arrangement can be achieved in the structure of the webbing take-up device, as well as enabling a simple structure for the webbing take-up device.
- According to the webbing take-up device of the third aspect, early actuation of the pawl is enabled.
- An exemplary embodiment of the invention will be described in detail with reference to the following figures, wherein:
-
FIG. 1 is an exploded perspective view showing relevant portions of a webbing take-up device according to an exemplary embodiment; -
FIG. 2 is a schematic cross-section showing relevant portions of the webbing take-up device shown inFIG. 1 ; -
FIG. 3 is a perspective view of the spool and the lock base shown inFIG. 1 ; -
FIG. 4 is an enlarged cross-section showing a housed state of a slider in the body shown inFIG. 1 , -
FIG. 5 is an explanatory drawing viewed from one side in the spool axial direction, to explain deformation of a wire by a first deforming portion and a second deforming portion when the slider shown inFIG. 1 is disposed in an initial position; and -
FIG. 6 is an explanatory drawing, corresponding toFIG. 5 , to explain a state in which a switching mechanism has actuated, and the slider has moved from the state shown inFIG. 5 toward a direction away from a second energy absorption portion. - Explanation follows regarding an exemplary embodiment of the present invention, with reference to the drawings. As shown in
FIG. 1 , a webbing take-up device 10 according to an exemplary embodiment of the present invention is configured including aframe 12 that is fixed to a vehicle body, aspool 20 disposed inside theframe 12, and atorsion shaft 40 serving as a “first energy absorption member”. The webbing take-up device 10 further includes alock mechanism 50, a sensor mechanism 60 (seeFIG. 2 ), anenergy absorption mechanism 70, aswitching mechanism 100, and aFL lock pawl 120 serving as a “pawl”. Explanation follows regarding respective configurations thereof. -
Frame 12 - The
frame 12 is configured including aframe body 14 and aside plate 16. Theframe body 14 includes a plate shapedback plate 14A, fixed to the vehicle body. Aside plate 14B extends substantially at a right angle from one width direction end of theback plate 14A (the end on the arrow C direction side inFIG. 1 ). Theframe body 14 further includes a coupling tab (piece) 14C that faces an upper portion of theback plate 14A (a portion on the arrow E direction side inFIG. 1 ). Thecoupling tab 14C extends from an upper portion of a leading end of theside plate 14B. A leading end portion of thecoupling tab 14C is formed with a first attachment tab (piece) 14D, thefirst attachment tab 14D being bent toward theback plate 14A side so as to face theside plate 14B. A second attachment tab (piece) 14E extends substantially at a right angle from another width direction end of theback plate 14A, thesecond attachment tab 14E being disposed facing theside plate 14B. The extension length of thesecond attachment tab 14E is set shorter than the extension length of theside plate 14B, and thesecond attachment tab 14E is disposed in the same plane as (flush with) thefirst attachment tab 14D. - The
side plate 16 is formed in a substantially rectangular plate shape, and is disposed parallel to thefirst attachment tab 14D and thesecond attachment tab 14E. Theside plate 16 is fixed to thefirst attachment tab 14D and thesecond attachment tab 14E through abody 72, described later. A circular shapedplacement hole 16A is formed in theside plate 16, and ratchetteeth 16B (inner teeth) are formed around the entire inner circumference of theplacement hole 16A. -
Spool 20 - The
spool 20 is formed in a substantially circular cylinder shape, is disposed inside theframe 12 with the axial direction along the width direction of theback plate 14A, and is indirectly supported by theframe 12 so as to be capable of rotation. One end portion in a length direction (a base end portion) of awebbing 30, formed in an elongated belt shape, is coupled and fixed to thespool 20. Thewebbing 30 is taken up from a base end side in a layered shape on an outer peripheral portion of thespool 20 by rotation of thespool 20 in a take-up direction (the arrow A direction inFIG. 1 ). Configuration is made such that by pulling a side of anther end portion in the length direction (a leading end portion) of thewebbing 30, thespool 20 is rotated in a pull-out direction (the arrow B direction inFIG. 1 ), pulling thewebbing 30 out from thespool 20. - As shown in
FIG. 2 , a through hole (penetrate-hole) 22 is formed penetrating in an axial center portion of thespool 20. Asupport shaft 34A of apinion 34 configuring a knownpre-tensioner mechanism 32 is fitted into a portion of the throughhole 22 on one end side in the axial direction of the spool 20 (the arrow C direction side inFIG. 2 ), so as to be capable of rotating as integrally (as a unit) therewith. As shown inFIG. 3 , one end side of thepinion 34 is formed withpinion teeth 34B, and thepinion teeth 34B are disposed on the one side in the axial direction of the spool 20 (the arrow C direction side inFIG. 3 ) with respect to thespool 20. Oneend portion 34C of thepinion 34 projects out further to the one side in the axial direction of thespool 20 than thepre-tensioner mechanism 32, and is disposed inside a biasing mechanism 36 (seeFIG. 2 ). Thebiasing mechanism 36 includes a spiral spring (not shown in the drawings). A spiral direction inside end of the spiral spring is fixed to the oneend portion 34C of thepinion 34, and the spiral direction outside end of the spiral spring is coupled to theside plate 14B (the frame 12), such that the spiral spring biases thespool 20 in the take-up direction. - As shown in
FIG. 2 , at an inner peripheral portion of the throughhole 22 of thespool 20, an engagedportion 22A is formed, that is engaged with thetorsion shaft 40, described later, at a position adjacent to thesupport shaft 34A of thepinion 34. An inner peripheral portion of the engagedportion 22A is formed with a spline shape as viewed along the axial direction of thespool 20. At the axial direction another end portion of thespool 20, apawl housing portion 24 is formed, that houses aFL lock pawl 120, described later. Thepawl housing portion 24 is disposed further to the outer side in the radial direction of thespool 20 than the throughhole 22, and is open toward the outer side in the radial direction of the spool 20 (seeFIG. 3 ). -
Torsion Shaft 40 - The
torsion shaft 40 is disposed coaxially to thespool 20, and is inserted into the throughhole 22. One end portion of the torsion shaft 40 (the end portion on the arrow C direction side inFIG. 2 ) is formed with afirst engagement portion 42. An outer peripheral portion of thefirst engagement portion 42 is formed with a spline shape (seeFIG. 1 for details), and thefirst engagement portion 42 is fitted into and engages with the engagedportion 22A of thespool 20. Thetorsion shaft 40 accordingly engages with thespool 20 so as to be capable of rotating integrally (as a unit) therewith. Another end portion of thetorsion shaft 40 projects out further than thespool 20 toward the another side in the axial direction of thespool 20, and is rotatably supported by asensor cover 62 of thesensor mechanism 60, described later. - At a portion on another end side of the
torsion shaft 40, asecond engagement portion 44 is formed, that engages with thelock base 52 of thelock mechanism 50, described later. Thesecond engagement portion 44 is disposed further toward the another side in the axial direction of thespool 20 than thepawl housing portion 24 of thespool 20, and an outer peripheral portion of thesecond engagement portion 44 is formed with a spline shape (seeFIG. 1 for details). A portion of thetorsion shaft 40 between thefirst engagement portion 42 and thesecond engagement portion 44 configures a firstenergy absorption portion 46. The firstenergy absorption portion 46 is formed in a shaft shape with a circular cross-section profile. The firstenergy absorption portion 46, described in more detail later, is configured so as to undergo torsional deformation (twisting deformation) to absorb kinetic energy of an occupant, which is used for a pulling of thewebbing 30. -
Lock Mechanism 50 - As shown in
FIG. 1 , thelock mechanism 50 is configured including alock plate 54 and alock base 52 serving as “base member”. As shown inFIG. 3 , thelock base 52 is formed in a substantially circular cylinder shape, and is disposed at the another side in the axial direction of the spool 20 (the arrow D direction side inFIGS. 1 and 3 ) with respect to thespool 20. Thelock base 52 is integrally formed with a substantially circular cylinder shapedcircular cylinder shaft 52A, thecircular cylinder shaft 52A being disposed coaxially to thelock base 52, and projecting out from thelock base 52 toward thespool 20 side. Anengaged hole 52B is formed at an axial center portion of thelock base 52, the engagedhole 52B being formed with a spline shape as viewed along the axial direction of the lock base 52 (seeFIG. 3 ). Thesecond engagement portion 44 of thetorsion shaft 40 is fitted into and engages with the engagedhole 52B inside, such that the lock base 52 (the lock mechanism 50) and thetorsion shaft 40 engage so as to be capable of rotating integrally (as a unit). In this state, thelock base 52 is disposed adjacent to thepawl housing portion 24 of thespool 20, on the another side in the axial direction of the spool 20 (seeFIG. 2 ). At thelock base 52, theguide groove 52C serving as “groove portion” is formed (configuring “guiding mechanism”) (seeFIG. 3 ), that is for leading (guiding) theFL lock pawl 120 described later. Theguide groove 52C is formed in a substantially S-shape as viewed along the axial direction of thespool 20, and is open toward thespool 20 side. - As shown in
FIG. 1 , thelock plate 54 is formed in a substantially rectangular plate shape, and is movably disposed inside thelock base 52. Note that a plate shapedplate cover 56 is provided at the another side in the axial direction of thespool 20 with respect to thelock base 52, theplate cover 56 restricting movement of thelock plate 54 toward the another side in the axial direction (the arrow D direction side inFIG. 1 ) at thelock base 52. One end portion of thelock plate 54 is integrally formed with a circular column shapedguide projection 54A. Theguide projection 54A projects out from thelock plate 54 toward the opposite side to thespool 20. Theguide projection 54A is inserted through ahole portion 56A formed at theplate cover 56, and is movably inserted inside aguide groove 64A of aV gear 64 configuring thesensor mechanism 60, described later (seeFIG. 2 ). The one end portion of thelock plate 54 is formed withratchet teeth 54B, and theratchet teeth 54B are configured so as to be capable of meshing with theratchet teeth 16B of theside plate 16 of theframe 12 described above. -
Sensor Mechanism 60 - As shown in
FIG. 2 , thesensor mechanism 60 is disposed on the another aside in the axial direction of thespool 20 with respect to theframe 12. Thesensor mechanism 60 includes asensor cover 62, thesensor cover 62 being formed in a substantially box shape open toward theframe 12 side and being coupled to theframe 12. TheV gear 64 that has a substantially circular disk shape is provided inside thesensor cover 62. TheV gear 64 is disposed coaxially to thespool 20, and is rotabably supported by the another end portion of thetorsion shaft 40. At theV gear 64, theguide groove 64A is formed, and theguide projection 54A of thelock plate 54 is movably inserted inside theguide groove 64A. - The
sensor mechanism 60 is configured to actuate in at least one event of a sudden vehicle deceleration or a sudden rotation of thespool 20 in the pull-out direction. When actuation of thesensor mechanism 60, rotation of theV gear 64 in the pull-out direction is restricted, and the spool 20 (the lock base 52) rotates in the pull-out direction relative to theV gear 64. Configuration is made such that due to thelock base 52 rotating in the pull-out direction with respect to theV gear 64, theguide projection 54A of thelock plate 54 moves within theguide groove 64A of theV gear 64, such that thelock plate 54 moves toward the outer side in the radial direction of thelock base 52, and theratchet teeth 54B of thelock plate 54 meshes with theratchet teeth 16B of theframe 12. -
Energy Absorption Mechanism 70 - As shown in
FIG. 2 , theenergy absorption mechanism 70 is provided between theframe 12 and thesensor mechanism 60. Moreover, as shown inFIG. 1 , theenergy absorption mechanism 70 is configured including abody 72, a lock ring 80 (which is an element recognized broadly as a “rotating body”), aslider 86, and awire 90 serving as a “second energy absorption member”. - The
body 72 is formed in a substantially rectangular parallelopiped box shape open toward theframe 12 side, and is fixed to thefirst attachment tab 14D and thesecond attachment tab 14E of theframe 12. Theside plate 16 of theframe 12 described above is fastened and fixed to abottom wall 72A of thebody 72 from the another side in the axial direction of thespool 20. - A
recess portion 74, open toward the another side in the axial direction of thespool 20, is formed at a substantially central portion of thebody 72. Therecess portion 74 is formed in a substantially circular shape as viewed along the axial direction of thespool 20, and is disposed coaxially to thespool 20. A circular shapedplacement hole 74B is formed at abottom wall 74A of therecess portion 74, penetrating thebottom wall 74A, and theplacement hole 74B being disposed coaxially to thespool 20. Thepawl housing portion 24 of thespool 20 is disposed within theplacement hole 74B and therecess portion 74. - A pair of deforming
columns bottom wall 74A of therecess portion 74. The deformingcolumns bottom wall 74A toward the another side in the axial direction of the spool at a separation from each other in the circumferential direction of theplacement hole 74B. As shown inFIG. 5 ,first deforming portions columns first deforming portions spool 20. As shown inFIG. 4 , acommunication hole 74C, in which theslider 86, described later, is disposed, is formed at an upper portion at a side wall of therecess portion 74. Thecommunication hole 74C places the inside of therecess portion 74 in communication with the inside of thebody 72. - As shown in
FIG. 1 , a gasgenerator housing portion 79 that houses agas generator 110 of theswitching mechanism 100, described later, is integrally formed at a portion of an upper portion of thebody 72 which portion is on the opposite side to theframe 12. The gasgenerator housing portion 79 is formed in a bottomed, substantially circular cylinder shape, and is disposed with its axial direction along the extension direction of theside plate 14B (along the arrow G direction and the arrow H direction inFIG. 1 ). - The
lock ring 80 is formed in a substantially circular cylinder shape, and is disposed coaxially to thespool 20. Thelock ring 80 is rotatably supported at thebody 72 inside therecess portion 74 of thebody 72, and is disposed at the outer side in the radial direction of thespool 20 with respect to thepawl housing portion 24 of thespool 20. At an outer peripheral portion of thelock ring 80, a ring shapedflange portion 80A is integrally formed at one end portion in the axial direction of the lock ring 80 (end portion on the arrow C direction side inFIG. 1 ). Theflange portion 80A is disposed facing an inner peripheral face of therecess portion 74 of thebody 72. The pair of deformingcolumns lock ring 80 with respect to the ring shapedflange portion 80A. - Ratchet
teeth 80B (inner teeth) are formed at an inner peripheral portion of thelock ring 80 at a portion at the one end side in the axial direction of thelock ring 80. Theratchet teeth 80B are formed around the entire circumference of thelock ring 80. Theratchet teeth 80B are moreover configured so as to be capable of meshing with theratchet teeth 120B of theFL lock pawl 120 described later. Moreover, at another end portion in the axial direction of thelock ring 80, ananchor groove 82 is formed that anchors ananchor hook 92 of thewire 90, described later. Theanchor groove 82 is formed in a slit shape, and is open toward the another side in the axial direction of thelock ring 80. Awire attachment face 84, onto which thewire 90 is wound, described later, is configured at an outer peripheral portion of thelock ring 80, thewire attachment face 84 being disposed facing the inner peripheral face of therecess portion 74 of thebody 72, and forming a concentric circular shape with the outer peripheral portion of thespool 20 as viewed along thespool 20 axial direction. - The
slider 86 is formed in a substantially rectangular column shape with its length direction along an up and down direction (the arrow E direction and the arrow F direction inFIG. 1 ). Moreover, as shown inFIG. 5 , theslider 86 is housed inside thebody 72 at the upper side of thelock ring 80, and is supported by thebottom wall 72A of thebody 72 so as to be capable of sliding in the up and down direction. - A lower end face of the slider 86 (the face on the arrow F direction side in
FIG. 1 andFIG. 5 ) configures asecond deforming portion 86A. Thesecond deforming portion 86A is curved in a substantially circular arc shape protruding toward the lower side (toward the axial center side) as viewed along thespool 20 axial direction. Astopper projection 86B is integrally formed to a lower end portion of theslider 86 at a portion on the side of thebottom wall 72A of thebody 72. Thestopper projection 86B projects out toward the lower side with respect to thesecond deforming portion 86A of theslider 86. - As shown in
FIG. 5 , an upper end face of theslider 86 abuts a lower face of a leading end portion (another end portion) of apiston 108, described later, blocking (preventing) movement of theslider 86 toward the upper side. Thesecond deforming portion 86A of theslider 86 is disposed between the pair of deformingcolumns 76 and 78 (in what is referred to below as the “initial position”). - The
wire 90 is configured by an elongated wire member, and is attached to the wire attachment face 84 of thelock ring 80. Specifically, as shown inFIG. 5 , one end portion in a length direction of thewire 90 is formed with theanchor hook 92 that is bent around into a substantially U-shape. The bent portion of theanchor hook 92 is inserted into theanchor groove 82 of thelock ring 80, anchoring theanchor hook 92 in theanchor groove 82. Thewire 90 extends from the anchor hook 92 (one end portion) around on thewire attachment face 84 toward the take-up direction, and is wound onto the wire attachment face 84 from the anchor hook 92 (one end portion) to another end portion in the length direction of the wire (seeFIG. 1 for details). In the wound-on state of thewire 90 to thewire attachment face 84, thewire 90 is disposed in a layered shape along the axial direction of thelock ring 80, and the another end in the length direction of thewire 90 is open (free). Thewire 90 is accordingly disposed between thewire attachment face 84 and the inner peripheral face of therecess portion 74. - Moreover, a portion of the
wire 90 wound onto thewire attachment face 84 is drawn out from thewire attachment face 84 toward outer side in the radial direction of thelock ring 80, curving so as to pass between thefirst deforming portions columns second deforming portion 86A of theslider 86. This drawn-out portion configures a secondenergy absorption portion 94. The secondenergy absorption portion 94 abuts thefirst deforming portions second deforming portion 86A, and is bent into a substantially M-shape as viewed along thespool 20 axial direction. In this state, as shown inFIG. 4 , thestopper projection 86B and thewire 90 overlap each other in thespool 20 axial direction (the arrow C direction and the arrow D direction inFIG. 4 ), and thestopper projection 86B restricts movement of thewire 90 toward the another side in the axial direction of the lock ring 80 (the arrow D direction side inFIG. 4 ). - As shown in
FIG. 5 , by thelock ring 80 rotating in the pull-out direction (the arrow B direction inFIG. 5 ), the secondenergy absorption portion 94 of thewire 90 is deformed by the pair offirst deforming portions second deforming portion 86A (“the secondenergy absorption portion 94 of thewire 90” and “the pair offirst deforming portions second deforming portion 86A” are abutted each other and relatively pressed each other, so the secondenergy absorption portion 94 of thewire 90 is deformed). Accordingly, as described in detail later, when theenergy absorption mechanism 70 is actuated, the secondenergy absorption portion 94 of thewire 90 is deformed, and the firstenergy absorption portion 46 of thetorsion shaft 40 undergoes twisting deformation. Configuration is thus made such that kinetic energy of the occupant, which is used for pulling of thewebbing 30, is absorbed by the firstenergy absorption portion 46 and the secondenergy absorption portion 94. - Note that since the second
energy absorption portion 94 of thewire 90 is drawn out from thewire attachment face 84 toward the outer side in the radial direction of thelock ring 80 and hooked (attached) around the pair of deformingcolumns wire 90 along the length direction of thewire 90. Accordingly, configuration is made such that when thelock ring 80 rotates toward the pull-out direction, thewire 90 deformed by the pair of deformingcolumns wire attachment face 84 after being deformed. -
Switching Mechanism 100 - As shown in
FIG. 1 , theswitching mechanism 100 is configured including acylinder 102, thepiston 108, and thegas generator 110. - The
cylinder 102 is housed inside thebody 72 at the upper side of thelock ring 80. Thecylinder 102 is formed in a substantially rectangular tube shape, and is disposed with its axial direction running parallel to the axial direction of the gasgenerator housing portion 79 of thebody 72. At one end portion of the cylinder 102 (the arrow H direction end portion inFIG. 1 ), a substantially tube shaped tube shapedportion 104 is integrally provided, the tube shapedportion 104 projecting out from thecylinder 102 toward the side of the gasgenerator housing portion 79 of the body 72 (the another side in the axial direction of the spool 20) and placing the inside of thecylinder 102 in communication with the inside of the gasgenerator housing portion 79. Note that theframe 12 side of thecylinder 102 is provided with a substantially rectangular plate shapedsupport plate 106. Thesupport plate 106 is fastened and fixed to thebody 72 with the plate thickness direction of thesupport plate 106 being in thespool 20 axial direction. Movement of thecylinder 102 toward theframe 12 side is accordingly restricted by thesupport plate 106. - The
piston 108 is formed in a substantially rectangular parallelopiped block shape, with its length direction along the axial direction of thecylinder 102. One end portion of the piston 108 (the arrow H direction end portion inFIG. 1 ) is integrally formed with a substantially cube shapedbase portion 108A, and thebase portion 108A is inserted inside thecylinder 102 in a sealed state. Configuration is made such that actuation of thegas generator 110, described later, supplies gas into thecylinder 102, moving thepiston 108 toward the another end side (the arrow G side inFIG. 1 ) of thecylinder 102. - An intermediate portion in the length direction of the
piston 108 is formed with a switching concave (indentation)portion 108B, the switchingconcave portion 108B being formed in a concave (indented) shape open toward the one side in the axial direction of the spool 20 (thesupport plate 106 side), and passing through (penetrating) thepiston 108 in the up and down direction (the arrow E direction and arrow F direction inFIG. 1 ). - As shown in
FIG. 6 , when thepiston 108 moves toward the another end side of thecylinder 102 and the switchingconcave portion 108B of thepiston 108 is disposed (positioned) at the upper side of theslider 86, theslider 86 moves from the initial position toward the upper side (in the arrow E direction inFIG. 6 ) due to a pressing force toward the upper side acting on theslider 86 from thewire 90, such that theslider 86 is inserted into the switchingconcave portion 108B of thepiston 108. Accordingly, when in this state, thewire 90 is deformed only by thefirst deforming portions columns - As shown in
FIG. 1 , thegas generator 110 is formed in a substantially circular column shape, housed inside the gasgenerator housing portion 79 of thebody 72. Thegas generator 110 is electrically connected to a controller of the vehicle (not shown in the drawings). Configuration is made such that on actuation of thegas generator 110 under control of the controller, thegas generator 110 generates gas and supplies the gas into thecylinder 102, moving thepiston 108 toward the another end side of thecylinder 102. - The controller is moreover electrically connected to a frame (physique) detection section, not shown in the drawings. The frame detection section detects the frame (physique) of an occupant seated in a seat using, for example, a load sensor, a belt sensor, a seat position sensor, and(or) the like. Specifically, the load sensor detects load acting on a vehicle seat, and the frame detection section detects the frame of the occupant using the detected load. The belt sensor detects a pull-out amount of the
webbing 30 from thespool 20, and the frame detection section detects the frame of the occupant using the detected pull-out amount. The seat position sensor is configured by a position detection sensor that detects a slide position of the vehicle seat in the front and rear direction, or a camera sensor provided in the vehicle compartment. The frame detection section detects the frame of the occupant using the seat position detected by the seat position sensor. - The controller is moreover electrically connected to a collision detection section, not shown in the drawings. The collision detection section predicts a vehicle collision using, for example, an acceleration sensor that detects the acceleration (in particular sudden deceleration) of the vehicle, a distance sensor that detects the distance to obstacle in front of vehicle, and(or) the like. Configuration is made such that the collision detection section detects a vehicle collision by the acceleration sensor detecting a collision acceleration of a predetermined reference value or greater.
- Configuration is made such that the controller actuates the
gas generator 110 of theswitching mechanism 100 in a case in which, based on a signal from the frame detection section, the controller has determined the frame of the occupant to be smaller than a predetermined reference value, and based on a signal from the collision detection section, the controller has determined that the vehicle has been involved in a collision. -
FL Lock Pawl 120 - Explanation follows regarding the
FL lock pawl 120 that is a relevant and main portion of the present invention. As shown inFIG. 1 , theFL lock pawl 120 is formed in a substantially triangular plate shape, and is movably housed inside thepawl housing portion 24 of thespool 20. Namely, theFL lock pawl 120 is disposed adjacent to thelock base 52 of thelock mechanism 50 in thespool 20 axial direction. - A circular column shaped
guide shaft 120A (configuring “guiding mechanism”), serving as a “shaft portion”, is integrally formed to one end portion of theFL lock pawl 120. Theguide shaft 120A projects out toward thelock base 52 side, and is movably inserted into one end portion of theguide groove 52C of the lock base 52 (seeFIG. 2 ). As shown inFIG. 5 , an outer peripheral portion of the one end portion of theFL lock pawl 120 is formed withratchet teeth 120B. Theratchet teeth 120B are exposed from thepawl housing portion 24 in a housed state of theFL lock pawl 120 inside thepawl housing portion 24 of the spool 20 (seeFIG. 3 ). - When relative rotating of the
spool 20 in the pull-out direction relative to thelock base 52, theguide shaft 120A of theFL lock pawl 120 is moved from the one end portion toward the another end portion of theguide groove 52C. TheFL lock pawl 120 accordingly moves toward the outer side in the radial direction of thespool 20, and theratchet teeth 120B of theFL lock pawl 120 mesh with theratchet teeth 80B of the lock ring 80 (seeFIG. 5 andFIG. 6 ). Thelock ring 80 and thespool 20 are accordingly coupled together by theFL lock pawl 120, to give a configuration in which thespool 20 and thelock ring 80 rotate integrally (as a unit) in the pull-out direction. Namely, configuration is made such that theenergy absorption mechanism 70 is actuated by coupling of thelock ring 80 and thespool 20 by theFL lock pawl 120. - Explanation follows regarding operation and advantageous effects of the exemplary embodiment of the present invention.
- First, the
webbing 30 is pulled out from thespool 20 and mounted over the body of the occupant by pulling on the leading end side of thewebbing 30. - Operation of the
Lock Mechanism 50 - In the mounted state of the
webbing 30 over the body of the occupant, rotation of theV gear 64 in the pull-out direction is restricted in at least one event out of a sudden vehicle deceleration or a sudden rotation of thespool 20 in the pull-out direction, and the spool 20 (the lock base 52) rotates in the pull-out direction relative to theV gear 64. When this occurs, theguide projection 54A of thelock plate 54 moves within theguide groove 64A of theV gear 64, such that thelock plate 54 moves toward the outer side in the radial direction of thelock base 52, and theratchet teeth 54B of thelock plate 54 mesh with theratchet teeth 16B of theframe 12. Rotation of thelock base 52 in the pull-out direction is thus blocked (prevented), blocking (preventing) rotation of thetorsion shaft 40 and thespool 20 in the pull-out direction. Thewebbing 30 is thereby restricted from being pulled out from thespool 20, and the body of the occupant that is attempting to move toward the front of the vehicle is restrained by thewebbing 30. The body of the occupant can accordingly be restrained by thewebbing 30 as a result. - Energy Absorption by the
Torsion Shaft 40 - In the actuated state of the
lock mechanism 50 described above, the firstenergy absorption portion 46 undergoes twisting deformation when a rotation force of thespool 20 in the pull-out direction, caused by the body of the occupant pulling on thewebbing 30 with greater force, exceeds a twisting withstand load (deformation withstand load) of the firstenergy absorption portion 46. Accordingly, rotation of thespool 20 in the pull-out direction is permitted at a first force limiter load (the load required for the firstenergy absorption portion 46 to undergo twisting deformation) or greater, and kinetic energy of the occupant, which is used for pulling on thewebbing 30, is absorbed by the firstenergy absorption portion 46. Load (burden) on the chest of the occupant from thewebbing 30 can be reduced as a result. - Operation of the
Energy Absorption Mechanism 70 - Due to the first
energy absorption portion 46 of thetorsion shaft 40 undergoing twisting deformation, thespool 20 rotates in the pull-out direction relative to the lock mechanism 50 (the lock base 52). When thespool 20 rotates in the pull-out direction relative to thelock base 52, theguide shaft 120A of theFL lock pawl 120 provided at thespool 20 moves from the one end portion to the other end portion of theguide groove 52C, and theFL lock pawl 120 moves toward the outer side in the radial direction of thespool 20. The ratchet tooth 26B of theFL lock pawl 120 accordingly mesh with theratchet teeth 80B of thelock ring 80, such that thelock ring 80 and thespool 20 are coupled together through the FL lock pawl 120 (seeFIG. 5 ). Thelock ring 80 and thespool 20 are accordingly capable of rotating together integrally (as a unit) in the pull-out direction. - The
lock ring 80 rotates in the pull-out direction (the arrow B direction inFIG. 5 ) when the rotation force of thespool 20 in the pull-out direction exceeds the twisting withstand load (deformation withstand load) of the firstenergy absorption portion 46 of thetorsion shaft 40 and the deformation withstand load of the secondenergy absorption portion 94 of thewire 90. Namely, the secondenergy absorption portion 94 of thewire 90 is deformed by thefirst deforming portions columns second deforming portion 86A of theslider 86. Accordingly, rotation of thespool 20 in the pull-out direction is permitted at a second force limiter load (the total of the load required for the firstenergy absorption portion 46 to undergo twisting deformation and the load required to deform the secondenergy absorption portion 94 of the wire 90) or greater, and kinetic energy of the occupant, which is used for pulling on thewebbing 30, is absorbed by the firstenergy absorption portion 46 and the secondenergy absorption portion 94. - Operation of the
Switching Mechanism 100 - The
switching mechanism 100 is actuated by the controller of the vehicle. The controller determines whether or not the body of the occupant is the predetermined reference value or greater based on a signal from the frame detection section, and determines whether or not the vehicle has been involved in a collision based on a signal from the collision detection section. In a case in which the controller has determined the body of the occupant to be the predetermined reference value or greater, thegas generator 110 is not actuated, and so thesecond deforming portion 86A of theslider 86 presses the secondenergy absorption portion 94 of thewire 90 toward the lower side in a state in which theslider 86 is disposed in the initial position as shown inFIG. 5 . Accordingly, rotation of thespool 20 in the pull-out direction at the second force limiter load described above or greater is permitted in a case in which the body of the occupant is the predetermined reference value or greater. - On the other hand, in a case in which the controller has determined the body of the occupant to be below the predetermined reference value based on a signal from the frame detection section, and the controller has determined that the vehicle has been involved in a collision based on a signal from the collision detection section, the
gas generator 110 is actuated under the control of the controller. - On actuation of the
gas generator 110, gas is supplied from thegas generator 110 into thecylinder 102. When gas is supplied into thecylinder 102, thepiston 108 moves toward the another end side of thecylinder 102. Accordingly, as shown inFIG. 6 , due to the actuation of thegas generator 110, thepiston 108 moves toward the another end side of thecylinder 102, disposing the switchingconcave portion 108B of thepiston 108 at the upper side of (above) theslider 86. When the switchingconcave portion 108B of thepiston 108 is disposed at the upper side of theslider 86, theslider 86 slides toward the upper side by the pressing force from thewire 90 acting on theslider 86 toward the upper side, and theslider 86 is inserted in the switchingconcave portion 108B of thepiston 108. When in this state, the secondenergy absorption portion 94 of thewire 90 is only deformed by the pair of deformingcolumns spool 20 in the pull-out direction is permitted at or above a second force limiter load that is set to a small load. - As described above, in the present exemplary embodiment, the
FL lock pawl 120 is actuated by rotation of thespool 20 in the pull-out direction relative to thelock base 52, thereby coupling thespool 20 to thelock ring 80 of theenergy absorption mechanism 70 by theFL lock pawl 120. The number of times theFL lock pawl 120 is actuated can accordingly be reduced in comparison to a case in which theFL lock pawl 120 always actuates when actuation of thelock mechanism 50. Wear and the like of theratchet teeth 120B of theFL lock pawl 120 can accordingly be suppressed. Margin for durability of theFL lock pawl 120 that actuates theenergy absorption mechanism 70 is accordingly improved. - The
FL lock pawl 120 is disposed adjacent to (thelock base 52 of) thelock mechanism 50 in thespool 20 axial direction. Accordingly, an efficient arrangement can be achieved in the structure of the webbing take-updevice 10, as well as enabling a simple structure of the webbing take-updevice 10. - The
lock base 52 of thelock mechanism 50 is formed with theguide groove 52C, and theguide shaft 120A of theFL lock pawl 120 is inserted inside theguide groove 52C. When thespool 20 rotates in the pull-out direction relative to thelock base 52, theguide shaft 120A of theFL lock pawl 120 moves within theguide groove 52C of thelock base 52, such that theFL lock pawl 120 is guided (moved) toward thelock ring 80 side of theenergy absorption mechanism 70. TheFL lock pawl 120 is accordingly guided (moved) toward thelock ring 80 side interlockingly to the relative rotation of thespool 20 with respect to thelock base 52, enabling early actuation of theFL lock pawl 120. - Note that in the present exemplary embodiment, configuration is made such that the
guide shaft 120A of theFL lock pawl 120 moves within theguide groove 52C of thelock base 52, thereby moving theFL lock pawl 120 toward the outer side in the radial direction of thespool 20; however, the configuration by which theFL lock pawl 120 is moved toward the outer side in the radial direction of the spool 20 (the guiding mechanism) is not limited thereto. For example, configuration may be made such that when thespool 20 rotates in the pull-out direction relative to thelock base 52, theFL lock pawl 120 is moved toward the outer side in the radial direction of thespool 20 by a spring member, such as a compression spring. Specifically, a retention member that retains a compression spring in a compressed state may be provided such that when thespool 20 rotates in the pull-out direction relative to thelock base 52, the retention of the compression spring by the retention member is released, and theFL lock pawl 120 is moved toward the outer side in the radial direction of thespool 20 by biasing force of the compression spring.
Claims (6)
1. A webbing take-up device comprising:
a spool that rotates in a pull-out direction by a webbing being pulled out;
a first energy absorption member that extends along an axial center of the spool, that has one end portion engaged with the spool such that the first energy absorption member is capable of rotating integrally with the spool, and that is configured so as to be capable of undergoing torsional deformation;
a lock mechanism that is engaged with another end portion of the first energy absorption member so as to be capable of rotating integrally with the first energy absorption member, and that actuates to block rotation of the first energy absorption member in the pull-out direction at least one of when a vehicle suddenly decelerates or when the spool suddenly rotates in the pull-out direction;
an energy absorption mechanism that includes a second energy absorption member, that actuates by being coupled to the spool, and that deforms the second energy absorption member; and
a pawl that is provided at the spool, that actuates by the spool rotating in the pull-out direction relative to the lock mechanism, and that couples the spool and the energy absorption mechanism.
2. The webbing take-up device of claim 1 , wherein the pawl is disposed adjacent to the lock mechanism in an axial direction of the spool.
3. The webbing take-up device of claim 1 , further comprising a guiding mechanism, provided at at least one of the pawl or the lock mechanism, that guides the pawl so as to move toward a side of the energy absorption mechanism due to the spool rotating in the pull-out direction relative to the lock mechanism.
4. The webbing take-up device of claim 2 , further comprising a guiding mechanism, provided at at least one of the pawl or the lock mechanism, that guides the pawl so as to move toward a side of the energy absorption mechanism due to the spool rotating in the pull-out direction relative to the lock mechanism.
5. The webbing take-up device of claim 2 , wherein:
the lock mechanism includes a base member that is engaged with the another end portion of the first energy absorption member so as to be capable of rotating integrally with the first energy absorption member;
a groove portion, that opens toward a side of the pawl, is formed at the base member;
a shaft portion, that is inserted inside the groove portion, is formed at the pawl; and
the shaft portion moves along the groove portion by the spool rotating in the pull-out direction relative to the lock mechanism, and the pawl moves toward a side of the energy absorption mechanism.
6. The webbing take-up device of claim 4 , wherein:
the lock mechanism includes a base member that is engaged with the another end portion of the first energy absorption member so as to be capable of rotating integrally with the first energy absorption member;
a groove portion configuring the guiding mechanism, that opens toward a side of the pawl, is formed at the base member;
a shaft portion configuring the guiding mechanism, that is inserted inside the groove portion, is formed at the pawl; and
the shaft portion moves along the groove portion by the spool rotating in the pull-out direction relative to the lock mechanism, and the pawl moves toward the side of the energy absorption mechanism.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2013-265610 | 2013-12-24 | ||
JP2013265610A JP6126986B2 (en) | 2013-12-24 | 2013-12-24 | Webbing take-up device |
Publications (2)
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US20150175124A1 true US20150175124A1 (en) | 2015-06-25 |
US9573563B2 US9573563B2 (en) | 2017-02-21 |
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US14/573,190 Active 2035-06-08 US9573563B2 (en) | 2013-12-24 | 2014-12-17 | Webbing take-up device |
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US (1) | US9573563B2 (en) |
JP (1) | JP6126986B2 (en) |
DE (1) | DE102014119147A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3239003A1 (en) * | 2015-05-27 | 2017-11-01 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US20180086304A1 (en) * | 2015-04-24 | 2018-03-29 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US20180154861A1 (en) * | 2015-04-24 | 2018-06-07 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US10202098B2 (en) * | 2015-04-24 | 2019-02-12 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US20190084513A1 (en) * | 2017-09-15 | 2019-03-21 | Toyota Jidosha Kabushiki Kaisha | Four-point seatbelt device for a vehicle |
US10906503B2 (en) | 2016-06-09 | 2021-02-02 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
Families Citing this family (3)
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JP2016203844A (en) * | 2015-04-24 | 2016-12-08 | 株式会社東海理化電機製作所 | Webbing rewinding device |
JP6498507B2 (en) * | 2015-04-24 | 2019-04-10 | 株式会社東海理化電機製作所 | Webbing take-up device |
CN108163646B (en) * | 2017-12-29 | 2019-07-12 | 湖州品创孵化器有限公司 | A kind of power cable wire rewinding and paying off machine |
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JP2001347921A (en) * | 2000-05-02 | 2001-12-18 | Takata Corp | Seat belt retractor |
JP3723423B2 (en) * | 2000-05-31 | 2005-12-07 | エヌエスケー・オートリブ株式会社 | Seat belt device |
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JP2009184520A (en) * | 2008-02-06 | 2009-08-20 | Tokai Rika Co Ltd | Webbing winding device |
JP5086210B2 (en) * | 2008-09-03 | 2012-11-28 | 株式会社東海理化電機製作所 | Webbing take-up device |
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2013
- 2013-12-24 JP JP2013265610A patent/JP6126986B2/en active Active
-
2014
- 2014-12-17 US US14/573,190 patent/US9573563B2/en active Active
- 2014-12-19 DE DE102014119147.1A patent/DE102014119147A1/en not_active Ceased
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US20020020776A1 (en) * | 2000-08-15 | 2002-02-21 | Tomonori Nagata | Webbing retractor |
US20040206844A1 (en) * | 2003-04-15 | 2004-10-21 | Takata Corporation | Seat belt retractor and seat belt device equipped with the same |
US20050087641A1 (en) * | 2003-10-14 | 2005-04-28 | John Bell | Seat belt retractor |
US20110303779A1 (en) * | 2010-06-10 | 2011-12-15 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
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US20180086304A1 (en) * | 2015-04-24 | 2018-03-29 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US20180154861A1 (en) * | 2015-04-24 | 2018-06-07 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US10202098B2 (en) * | 2015-04-24 | 2019-02-12 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US10434978B2 (en) * | 2015-04-24 | 2019-10-08 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
EP3239003A1 (en) * | 2015-05-27 | 2017-11-01 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US10040419B2 (en) | 2015-05-27 | 2018-08-07 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US10906503B2 (en) | 2016-06-09 | 2021-02-02 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing take-up device |
US20190084513A1 (en) * | 2017-09-15 | 2019-03-21 | Toyota Jidosha Kabushiki Kaisha | Four-point seatbelt device for a vehicle |
Also Published As
Publication number | Publication date |
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US9573563B2 (en) | 2017-02-21 |
JP6126986B2 (en) | 2017-05-10 |
DE102014119147A1 (en) | 2015-06-25 |
JP2015120432A (en) | 2015-07-02 |
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